Spring Security versions 5.2.x prior to 5.2.4 and 5.3.x prior to 5.3.2 contain a signature wrapping vulnerability during SAML response validation. When using the spring-security-saml2-service-provider component, a malicious user can carefully modify an otherwise valid SAML response and append an arbitrary assertion that Spring Security will accept as valid.

• Spring Security
  • 5.2.x prior to 5.2.4
  • 5.3.x prior to 5.3.2

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• Spring Security
  • 5.2.4
  • 5.3.2

This issue was identified and responsibly reported by Sam Tinklenberg.